My dad LOVES telling strangers all about it, he thinks it is brilliant. My mum always does the "Are you SURE I can give her x? Are you SURE she won't choke?" but is supportive and follows my lead. It isn't extreme or odd but it is different to what they used to do so there can be apprehensive but I know my mums concerns come from love so I just understand and reassure. One of my SIL has now done BLS with her second and asked me some advice. Don't think I've really discussed it with many people, I just sort of do it. I think most mums I know either do it or are aware of it.